Printing group of a rotary printing press
A printing group of a rotary printing press includes at least one forme cylinder and at least one transfer cylinder. The forme cylinder has at least two printing forme end channels. These two channels are spaced circumferentially. At least one of these forme cylinder end receiving channels rolls off against a channel in the transfer cylinder. One of the forme cylinder end receiving channels is at least partially covered by a printing forme carried by the forme cylinder.
1. A printing group of a rotary printing press comprising:
a transfer cylinder, said transfer cylinder having a transfer cylinder barrel with a transfer cylinder barrel circumference of twice the length of a newspaper page and with a transfer cylinder barrel axial width;
a forme cylinder working together with said transfer cylinder and forming a cylinder pair in cooperation with said transfer cylinder, said forme cylinder having a forme cylinder barrel with a forme cylinder barrel circumference and with a forme cylinder barrel axial width;
a continuous longitudinal groove in said transfer cylinder and extending axially over said entire transfer cylinder barrel width, said continuous longitudinal groove having a gap with a gap width of between 1 mm and 5 mm;
two printing blankets on said transfer cylinder barrel, said at least two printing blankets being arranged axially aligned side by side on said transfer cylinder barrel, each of said printing blankets being a multi-layered blanket and including an underlying dimensionally stable support plate and a resilient upper layer permanently connected to said support plate, each of said at least two printing blankets having a length of said transfer cylinder barrel circumference; and
first and second forme cylinder grooves in said forme cylinder barrel, said first and second forme cylinder grooves being offset in a circumferential direction of said forme cylinder barrel by 180°, at least one of said forme cylinder grooves extending along said entire axial width of said barrel of said forme cylinder.
2. The printing group of claim 1 wherein both of said first and second forme cylinder grooves extend over said entire width of said forme cylinder barrel.
3. The printing group of claim 1 wherein said forme cylinder circumference is equal to said transfer cylinder circumference.
4. The printing group of claim 1 wherein said transfer cylinder has said barrel width of at least four newspaper pages.
5. The printing group of claim 1 wherein said transfer cylinder continuous longitudinal groove has a width greater than twice a thickness of an end of each said printing blanket and no greater than 3 mm.
6. The printing group of claim 1 wherein said resilient upper layer which is permanently connected to said support plate is a rubber layer.
7. The printing group of claim 1 wherein a ratio of said circumference of said transfer cylinder barrel to a circumference of said forme cylinder is a whole number.
8. The printing group of claim 1 further including at least first and second printing formes on said forme cylinder, said at least first and second printing formes including ends, said printing forme ends being aligned axially along said forme cylinder barrel axial width.
9. The printing group of claim 1 further including a plurality of printing formes arranged on said forme cylinder barrel one behind the other in said circumferential direction of said forme cylinder barrel.
10. The printing group of claim 1 wherein said forme cylinder barrel has a circumferential length corresponding to at least two newspaper pages.
11. The printing group of claim 1 wherein said transfer cylinder barrel width corresponds to at least six newspaper pages.
12. The printing group of claim 1 wherein said first and second forme cylinder grooves each have a width greater than twice the thickness of a printing forme and between 1 and 5 mm.
13. The printing group of claim 12 wherein said width is no greater than 3mm.
14. The printing group of claim 1 further including a holding device in each said groove.
15. The printing group of claim 1 further including a counter-pressure cylinder working together with said transfer cylinder.